Here's the thing. There is no MAGIC to the 4 day pattern, it's just a way of being in with one attempt in the fertile window (or two max) So you can do it EITHER way really (altho what you're saying I'd call e3d). You can even go farther and have 4 full days between attempts or 5 or whatever.
Think of it this way. More attempts = better chance of conception, but possibly more blue friendly. Fewer attempts = lower chance conception but possibly more pink friendly. So every person needs NOT to get hung up on some relatively arbitrary BD schedule that I made up, but to weigh the two options and then decide what is going to be best for you personally given your situation.